$NetBSD: patch-CMakeLists.txt,v 1.1 2023/12/19 12:28:50 thor Exp $

Make the build just use the modern FindBLAS and FindLAPACK builtins
of a recent-ish cmake. That avoids so much trouble forcing choices.

--- CMakeLists.txt.orig	2016-06-16 16:27:07.000000000 +0000
+++ CMakeLists.txt
@@ -28,7 +28,7 @@
 ## NOTE: More details: https://arma.sourceforge.net/faq.html
 
 
-cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.6 FATAL_ERROR)
 
 if(NOT (${CMAKE_MAJOR_VERSION} LESS 3))
   if(POLICY CMP0025)
@@ -249,194 +249,21 @@ message(STATUS "*** Looking for external
 ## Find LAPACK and BLAS libraries, or their optimised versions
 ##
 
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake_aux/Modules/")
-
-if(APPLE)
-  message(STATUS "Detected macOS")
-  
-  set(ARMA_USE_LAPACK     true)
-  set(ARMA_USE_BLAS       true)
-  set(ARMA_USE_ACCELERATE true)
-  
-  if(ALLOW_OPENBLAS_MACOS)
-    include(ARMA_FindOpenBLAS)
-    message(STATUS "OpenBLAS_FOUND = ${OpenBLAS_FOUND}")
-    message(STATUS "")
-    message(STATUS "*** If use of OpenBLAS is causing problems,")
-    message(STATUS "*** rerun cmake with detection of OpenBLAS disabled:")
-    message(STATUS "*** cmake -D ALLOW_OPENBLAS_MACOS=false .")
-    message(STATUS "")
-    
-    if(OpenBLAS_FOUND)
-      set(ARMA_LIBS ${ARMA_LIBS} ${OpenBLAS_LIBRARIES})
-      set(ARMA_USE_ACCELERATE false)
-    endif()
-  endif()
-  
-  if(ALLOW_BLAS_LAPACK_MACOS)
-    include(ARMA_FindBLAS)
-    include(ARMA_FindLAPACK)
-    message(STATUS "  BLAS_FOUND = ${BLAS_FOUND}"  )
-    message(STATUS "LAPACK_FOUND = ${LAPACK_FOUND}")
-    message(STATUS "")
-    message(STATUS "*** If use of BLAS and LAPACK is causing problems,")
-    message(STATUS "*** rerun cmake with detection of BLAS and LAPACK disabled:")
-    message(STATUS "*** cmake -D ALLOW_BLAS_LAPACK_MACOS=false .")
-    message(STATUS "")
-    
-    if(BLAS_FOUND AND LAPACK_FOUND)
-      set(ARMA_LIBS ${ARMA_LIBS} ${BLAS_LIBRARIES})
-      set(ARMA_LIBS ${ARMA_LIBS} ${LAPACK_LIBRARIES})
-      set(ARMA_USE_ACCELERATE false)
-    endif()
-  endif()
-  
-  if(ARMA_USE_ACCELERATE)
-    set(ARMA_LIBS ${ARMA_LIBS} "-framework Accelerate")  # or "-framework accelerate" ?
-    message(STATUS "Added '-framework Accelerate' to compiler flags")
-  endif()
-  
-  if(DEFINED CMAKE_CXX_COMPILER_ID)
-    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-      message(STATUS "Detected Clang compiler on macOS. Added '-stdlib=libc++' to compiler flags")
-    endif()
-    
-    if(NOT (${CMAKE_MAJOR_VERSION} LESS 3))
-      if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-        message(STATUS "Detected AppleClang compiler on macOS. Added '-stdlib=libc++' to compiler flags")
-      endif()
-    endif()
-  endif()
-  
-  set(CMAKE_MACOSX_RPATH 1)
-  
-else()
-  
-  if(ALLOW_FLEXIBLAS_LINUX AND (${CMAKE_SYSTEM_NAME} MATCHES "Linux"))
-    include(ARMA_FindFlexiBLAS)
-  else()
-    set(FlexiBLAS_FOUND false)
-  endif()
-  
-  include(ARMA_FindMKL)
-  include(ARMA_FindOpenBLAS)
-  include(ARMA_FindATLAS)     # TODO: remove support for ATLAS in next major version
-  include(ARMA_FindBLAS)
-  include(ARMA_FindLAPACK)
-  
-  message(STATUS "FlexiBLAS_FOUND = ${FlexiBLAS_FOUND}" )
-  message(STATUS "      MKL_FOUND = ${MKL_FOUND}"       )
-  message(STATUS " OpenBLAS_FOUND = ${OpenBLAS_FOUND}"  )
-  message(STATUS "    ATLAS_FOUND = ${ATLAS_FOUND}"     )
-  message(STATUS "     BLAS_FOUND = ${BLAS_FOUND}"      )
-  message(STATUS "   LAPACK_FOUND = ${LAPACK_FOUND}"    )
-  
-  if(FlexiBLAS_FOUND)
-    
-    set(ARMA_USE_LAPACK true)
-    set(ARMA_USE_BLAS   true)
-    
-    set(ARMA_LIBS ${ARMA_LIBS} ${FlexiBLAS_LIBRARIES})
-    
-    message(STATUS "")
-    message(STATUS "*** Using FlexiBLAS to access BLAS and LAPACK functions.")
-    message(STATUS "*** https://www.mpi-magdeburg.mpg.de/projects/flexiblas")
-    message(STATUS "*** WARNING: SuperLU and ARPACK must also link with FlexiBLAS.")
-    message(STATUS "")
-    message(STATUS "*** If using FlexiBLAS causes problems, ")
-    message(STATUS "*** rerun cmake with FlexiBLAS detection disabled:")
-    message(STATUS "*** cmake -D ALLOW_FLEXIBLAS_LINUX=false .")
-    message(STATUS "")
-    
-  elseif(MKL_FOUND)
-    
-    set(ARMA_USE_LAPACK true)
-    set(ARMA_USE_BLAS   true)
-    set(ARMA_LIBS ${ARMA_LIBS} ${MKL_LIBRARIES})
-    
-    message(STATUS "")
-    message(STATUS "*** If the MKL libraries are installed in non-standard locations such as")
-    message(STATUS "*** /opt/intel/mkl, /opt/intel/composerxe/, /usr/local/intel/mkl")
-    message(STATUS "*** make sure the run-time linker can find them.")
-    message(STATUS "*** On Linux systems this can be done by editing /etc/ld.so.conf")
-    message(STATUS "*** or modifying the LD_LIBRARY_PATH environment variable.")
-    message(STATUS "")
-    message(STATUS "*** On systems with SELinux enabled (eg. Fedora, RHEL),")
-    message(STATUS "*** you may need to change the SELinux type of all MKL libraries")
-    message(STATUS "*** to fix permission problems that may occur during run-time.")
-    message(STATUS "")
-    
-  else()
-    
-    if(OpenBLAS_FOUND AND ATLAS_FOUND)
-      message(STATUS "")
-      message(STATUS "*** NOTE: found both OpenBLAS and ATLAS; ATLAS will not be used")
-    endif()
-    
-    if(OpenBLAS_FOUND AND BLAS_FOUND)
-      message(STATUS "")
-      message(STATUS "*** NOTE: found both OpenBLAS and BLAS; BLAS will not be used")
-    endif()
-    
-    if(OpenBLAS_FOUND)
-      
-      set(ARMA_USE_BLAS true)
-      set(ARMA_LIBS ${ARMA_LIBS} ${OpenBLAS_LIBRARIES})
-      
-      if(OPENBLAS_PROVIDES_LAPACK)
-        set(ARMA_USE_LAPACK true)
-      else()
-        message(STATUS "")
-        message(STATUS "*** NOTE: if OpenBLAS is known to provide LAPACK functions, recommend to")
-        message(STATUS "*** NOTE: rerun cmake with the OPENBLAS_PROVIDES_LAPACK option enabled:")
-        message(STATUS "*** NOTE: cmake -D OPENBLAS_PROVIDES_LAPACK=true .")
-      endif()
-      
-      message(STATUS "")
-      message(STATUS "*** If the OpenBLAS library is installed in")
-      message(STATUS "*** /usr/local/lib or /usr/local/lib64")
-      message(STATUS "*** make sure the run-time linker can find it.")
-      message(STATUS "*** On Linux systems this can be done by editing /etc/ld.so.conf")
-      message(STATUS "*** or modifying the LD_LIBRARY_PATH environment variable.")
-      message(STATUS "")
-      
-    else()
-      
-      if(ATLAS_FOUND)
-        set(ARMA_USE_ATLAS true)
-        set(ARMA_LIBS ${ARMA_LIBS} ${ATLAS_LIBRARIES})
-        
-        message(STATUS "")
-        message(STATUS "*** NOTE: support for ATLAS is deprecated and will be removed;")
-        message(STATUS "*** NOTE: recommend to use OpenBLAS or FlexiBLAS instead.")
-        message(STATUS "")
-      endif()
-      
-      if(BLAS_FOUND)
-        set(ARMA_USE_BLAS true)
-        set(ARMA_LIBS ${ARMA_LIBS} ${BLAS_LIBRARIES})
-      endif()
-      
-    endif()
-    
-    if(LAPACK_FOUND)
-      if(OpenBLAS_FOUND AND OPENBLAS_PROVIDES_LAPACK)
-        message(STATUS "*** NOTE: found both OpenBLAS and LAPACK;")
-        message(STATUS "*** NOTE: option OPENBLAS_PROVIDES_LAPACK is enabled,")
-        message(STATUS "*** NOTE: so will not link with plain LAPACK.")
-        message(STATUS "")
-      else()
-        set(ARMA_USE_LAPACK true)
-        set(ARMA_LIBS ${ARMA_LIBS} ${LAPACK_LIBRARIES})
-      endif()
-    endif()
-    
-  endif()
-  
+# In a nice world, this encompasses any implementation, including
+# Acclerate.
+find_package(BLAS)
+find_package(LAPACK)
+message(STATUS "     BLAS_FOUND = ${BLAS_FOUND} (${BLAS_LIBRARIES})"      )
+message(STATUS "   LAPACK_FOUND = ${LAPACK_FOUND} (${LAPACK_LIBRARIES})"  )
+if(BLAS_FOUND AND LAPACK_FOUND)
+  set(ARMA_LIBS ${ARMA_LIBS} ${BLAS_LIBRARIES})
+  set(ARMA_LIBS ${ARMA_LIBS} ${LAPACK_LIBRARIES})
+  set(ARMA_USE_LAPACK  true)
+  set(ARMA_USE_BLAS    true)
+  set(ARMA_USE_ACCELERATE false)
 endif()
 
+set (CMAKE_MODULE_PATH "/data/projekte/pkgsrc/work/math/armadillo/work/.buildlink/cmake-Modules" ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake_aux/Modules/")
 
 include(ARMA_FindARPACK)
 message(STATUS "ARPACK_FOUND = ${ARPACK_FOUND}")
@@ -462,16 +289,6 @@ if(NOT ARMA_USE_LAPACK)
   message(STATUS "")
   message(STATUS "*** WARNING: Use of LAPACK is not enabled, as no LAPACK compatible library has been found.")
   message(STATUS "*** WARNING: This will materially degrade the available functionality in Armadillo.")
-
-  if(OpenBLAS_FOUND)
-    message(STATUS "")
-    message(STATUS "*** NOTE: OpenBLAS found but LAPACK not found.")
-    message(STATUS "*** NOTE: OpenBLAS may have been built without LAPACK functions,")
-    message(STATUS "*** NOTE: so cannot assume that LAPACK functions are available.")
-    message(STATUS "*** NOTE: To forcefully assume that OpenBLAS provides LAPACK functions,")
-    message(STATUS "*** NOTE: rerun cmake with the OPENBLAS_PROVIDES_LAPACK option enabled:")
-    message(STATUS "*** NOTE: cmake -D OPENBLAS_PROVIDES_LAPACK=true .")
-  endif()
 endif()